The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 1977
Filed:
Feb. 27, 1976
Applicant:
Inventor:
Duane W Wallace, Houston, TX (US);
Assignee:
Reed Tool Company, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16C / ;
U.S. Cl.
CPC ...
308 / ; 308241 ;
Abstract
A wear resistant tubular well tool, such as a tool joint, comprises a hollow cylindrical body having a hard metal, such as a coarse-grained sintered tungsten carbide, deposited on a portion of the exterior of the body and a fine-grained hard metal, such as a cast tungsten carbide, deposit covering substantially all of the external surface of said coarse-grained hard metal deposit. The method of making the well tool comprises depositing the coarse-grained hard metal by welding and then casting or fusing the finegrained hard metal over the coarse-grained hard metal layer.